The embattled National Security Agency is about to get new leaders to deal with the ongoing fallout from whistleblower Edward Snowden’s surveillance disclosures.

Vice-admiral Michael Rogers, the commander of the US navy’s tenth fleet and its Fleet Cyber Command, will take over from NSA Director Keith Alexander, who reluctantly became a global figure in the wake of the Snowden revelations.

Richard Ledgett, the head of the agency’s investigation into Snowden – who publicly floated the prospect of an amnesty for the former contractor – will become the NSA’s new deputy director and top civilian leader.

The appointments, both long anticipated, were announced by the Pentagon on Thursday.

Rogers is a longtime cryptologist in the Navy, whose informal turn it was to nominate a director for the NSA. Alexander is an Army general; and his predecessor, Michael Hayden, hailed from the Air Force.